Geared drill brace



June 30, 1925.

W. E. NOLAN GEARED DRILL BRACE Filed Nov. 24. 1924 '1'NVENTOR. W/LL/AM [DH/A190 Nam/v ATTORNEYS.

Patented June 30, 1925.

UNITED STATES p T t N F1 CE WKLLIAM EDWARD NOLAN, OF SAN FRANCISCO, CALIFQRNIA.

GEABED DRILL BRACE.

Application filed November 24, 1924. Serial No. 751,978.

Francisco, State of California, have invented a new and useful Geared Drill Brace,

. of which the following is a specification.

This invention relates to mechanics drill braces and in particular to a special type of geared brace providing a choice of speeds for the drill.

The principal objects of my invention are to provide a better and quicker operated control for chan ing the gear ratio or speed rotation of the (Frill and also to provide an improved arrangement of thrust bearing members which will be effective at either slow or fast speed of rotation of the drill chuck spindle.

In the drawing accompanying this speci fication,

Figure 1 is a side view of my geared brace with a portion of the body and control mechanism shown in section;

Figure 2 is a sectional view of the ratchet head and body pontion; as seen from the line 22 of Figure 1.

Figure 3 is a sectional view of the head and body as seen from along the line 3-3 of Figure 1.

In further detail, 1 represents the drill chuck of a conventional construction, 2 the revolvable operating handle or crank, 3 the auxiliary steadying handle supporting the breast plate 4 and in which the outer end of the operating handle is pivoted at 5.

The chuck is pinned at 6 to a spindle 7 revolvably extending through a body or head 8 secured to the lower end of the outeror steadying handle 3 and into a ratchet hub 9 revolvably carried at the lower end of the operating handle.

This ratchet head has pawl teeth 10 adapted to receive either or both pivoted ratchet pawls l1 controlled by a pivoted pawl lock 12 in the well known manner 'for providing a positive drive to the ratchet hub in either direction or in both directions.

On the under end of the ratchet hub is a rib or ribs 13 forming a jaw clutch, and secured to the upper portion of the spindle is a pinion 1% cross grooved at 15 to freely receive the ribs 13 so as to form a mating jaw clutch for driving the pinion from the I ratchet hub.

The pinion is slidable up and down in the head and ratchet hub so that the pinion may be thrown in and out of clutching en agement with the ratchet hub, and the hu extends downward into a recess 16 in the head 8 and takes the form of a cage 9 revolvably supporting several small pinions 17 meshing at their outer portions with an internal gear ring 18 formed in the recess of the head 8 so that upon each revolution of the cage the pinions will be carried around the fixed internal gear and thus revolve on their own pivots several times, depending on the ratio of the pinions to the internal gear.

The clutch pinion 14 fixed to spindle 7 is adapted to slide with the spindle downward into a central position meshing with all the pinions as shown in Figure 3 thus producing a hi h or multiplied speed of rotation to the rill chuck upon simply revolving the handle 2 in the same manner as for the direct drive when the pinion 1 1 is engaged with the clutch ribs 13.

To rotatively support the spindle 7 the head 8 has a neck 8 extending downward and bored to fit the spindle and preferably reduced somewhat in diameter at its lower end as shown.

Surrounding this reduced end of neck 8' is a special collar 19 having a spiral shaped slot 20 cut through one wall and through which it is secured to the reduced neck by a pin or screw 21 freely working in the slot so that upon rotation of the collar within limits of the slot the collar will be forced either up or down as guided by the slot, and the pin will seat in either end of the slot which is recessed slightly as shown so as to tend to hold it at either end, and the collar is further held in position at either end of the slot by a spring actuated friction button or ball 22 in the collar bearing on the re duced neck and adapted to. snap into suitable depressions therein at opposite limits of the collar movement.

Surrounding the shifting collar 19 and covering the slot 20 is a dust cover or sleeve 23 secured to the collar by any'means, such as a screw 24, and freely movable upon the neck 8' so as not to interfere with the movement of the collar. 1

The collar has an internal flange 25 to take the thrust in drilling and the spindle 7 has a shoulder 7 spaced from the flange by a row of thrust balls 26 to reduce the friction to a minimum.

Below the shoulder 7 the collar 19 is provided with a retaining nut 27 screwed in place and which cooperates with flange 25 to positively move the spindle and thereby the pinion 14 up or down to engage either the clutch or the high speed pinions when the collar is turned.

Figure 1 shows the spindle in upper position with pinion 14 enga ed with the clutch for. direct drive, and t e dotted osition of the drill chuck shows it as when t e spindle is lowered to, bring the high speed pinions into mesh. 7

From the. foregoing the operation of the brace should be understood, the brace being held against the work by pressure of the hand or breast against the plate 4 and the outer member 3 steadied against turning,

while the inner handle 2 is used like any brace to revolve the chuck spindle, but throu h the special ratchet head construction tie chuck may be revolved either at a high or low speed with a given speed of rotation of the handle 2, for mstance, when the collar 19 is revolved to lift the pinion 14 in engagement with the ribs 13 of the ratchet hub as described, the drill chuck is in direct gear and revolves once every turn of the handle, whereas when the spindle and gear 14 is lowered in the manner described, it 'falls between the planetary pinions 17 carried on the ratchetlhead and is then in high gear and is revolved at a much higher rate of speed in the same direction.

'Thus either high'or low speed of drill may be hadwith constant rotation of the brace handle by simply turning the conthe right or left 1 having thrust engagement with the spind e.

and means adapted for moving the sleeve axially with t e spindle upon manually turning the sleeve. 7

2. In a giared drill brace of the character descri d, a body, a chuck spindle revolvably supported therein and axiall slid-' posi-. as

able from a direct driveto a geare tion, means for sliding said spindle comrismg a sleeve surrounding the spindle and ody having double thrust engagement with the spindle, an angularly dis osed slot in said sleeve and a device exten ing from the body into the slot whereby upon manual turning of the sleeve the same will be moved axially and thereby carry the spindle from one position to the other.

3. A drill brace havinga chuck secured to a spindlerotatably mounted on the brace head, means for engaging the spindle with the brace head for direct rotation therewith and gear means for transmitting a higher ,rotative speed to the chuck, and a device coaxial with the spindle adapted upon turning relative to the brace to selectively en gage either of said means.

WILLIAM EDWARD NOLAN. 

